Robart Scale Retracts TailwheelThese are the only small units available for scale tail wheel retraction. They f These are the only small units available for scale tail wheel retraction. They feature spring centering and a steering mechanism. The unit operates from a conventional retract servo or air cylinder and has self locking down. Note: You will need to purchase a standard Air Cylinder (F RB165) with these retracts. Recommended for model weights up to 12lb (5443g).